Circle of 5ths

It is important to get to know this circle with all your heart:)

Outside are are the major scales and inside are the corresponding minor scales.

C major and A minor (natural) have no flats/sharps.  Going around the circle clockwise you add a sharp until you reach F sharp with six sharps.  Going counter-clockwise you do the same thing with flats.  

Memorize this circle and be able to reproduce it on your own and you are one step closer to memorizing all your major/minor scales!

Here is another chart that shows the flats and sharps.